feat: Implement Discount Product and Shopping Cart functionalities

- Added UpdateDiscountProductCommandValidator for validating discount product updates.
- Created GetDiscountProductByIdQuery and its handler for retrieving discount product details by ID.
- Implemented GetDiscountProductsQuery and handler for fetching a list of discount products with filtering options.
- Developed AddToCartCommand and handler for adding products to the shopping cart.
- Implemented ClearCartCommand and handler for clearing the shopping cart.
- Created RemoveFromCartCommand and handler for removing items from the cart.
- Added UpdateCartItemCountCommand and handler for updating the quantity of items in the cart.
- Developed GetUserCartQuery and handler for retrieving the user's shopping cart details.
- Implemented Product Tag functionalities including assigning tags to products, creating, updating, and deleting tags.
- Added queries for fetching all tags and products by tag.

src/BackOffice.BFF.Application/DiscountOrderCQ/Queries/GetOrderById/GetOrderByIdResponseDto.cs

@@ -0,0 +1,44 @@
+namespace BackOffice.BFF.Application.DiscountOrderCQ.Queries.GetOrderById;
+
+public class GetOrderByIdResponseDto
+{
+    public long Id { get; set; }
+    public long UserId { get; set; }
+    public string TrackingCode { get; set; }
+    public int Status { get; set; }
+    public string StatusTitle { get; set; }
+    public long TotalPrice { get; set; }
+    public long DiscountBalanceUsed { get; set; }
+    public long GatewayPayment { get; set; }
+    public long FinalPrice { get; set; }
+    public string PaymentTransactionCode { get; set; }
+    public string AdminNote { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public DateTime? PaidAt { get; set; }
+    
+    public AddressInfoDto ShippingAddress { get; set; }
+    public List<OrderItemDto> Items { get; set; } = new();
+}
+
+public class AddressInfoDto
+{
+    public long Id { get; set; }
+    public string RecipientName { get; set; }
+    public string RecipientPhone { get; set; }
+    public string Province { get; set; }
+    public string City { get; set; }
+    public string PostalCode { get; set; }
+    public string FullAddress { get; set; }
+}
+
+public class OrderItemDto
+{
+    public long Id { get; set; }
+    public long ProductId { get; set; }
+    public string ProductTitle { get; set; }
+    public long UnitPrice { get; set; }
+    public int DiscountPercent { get; set; }
+    public int Quantity { get; set; }
+    public long TotalPrice { get; set; }
+    public long DiscountedPrice { get; set; }
+}